LOCATION LORENA WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Ultic Argixerolls
TYPICAL PEDON: Lorena silt loam-cultivated on a 2 percent west-facing slope at an elevation of 2,050 feet. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 8 inches; brown (10YR 5/3) silt loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, friable, slightly sticky and slightly plastic; many fine roots; many fine irregular pores; slightly acid (pH 6.4); clear wavy boundary. (4 to 9 inches thick)
A--8 to 16 inches; brown (10YR 5/3) silt loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine and common fine roots; many fine irregular pores; slightly acid (pH 6.4); clear smooth boundary. (5 to 10 inches thick)
BA--16 to 20 inches; yellowish brown (10YR 5/4) silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many fine irregular and common fine tubular pores; neutral (pH 6.6); clear smooth boundary. (0 to 6 inches thick)
Bt1--20 to 31 inches; yellowish brown (10YR 5/4) silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common fine roots; common fine irregular and tubular pores; few faint clay flows in pores; neutral (pH 6.8); clear smooth boundary. (8 to l2 inches thick)
Bt2--31 to 36 inches; yellowish brown (10YR 5/4) silt loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few fine roots; common fine irregular and tubular pores; few faint clay flows in pores; neutral (pH 7.0); abrupt wavy boundary. (3 to 8 inches thick)
2R--36 inches; basalt bedrock.
TYPE LOCATION: Klickitat County, Washington; about 6 miles west of Centerville, 20 feet north and 50 feet east of the southwest corner of section 2, T. 3 N., R. 14 E. Latitude 45 degrees, 46 minutes, 03 seconds N. and Longitude 121 degrees, 01 minutes, and 46 seconds W.
RANGE IN CHARACTERISTICS: These soils are usually moist but are dry in the moisture control section for 75 to 90 consecutive days following summer solstice. The mean annual soil temperature is 48 to 51 degrees F. Depth to bedrock ranges from 20 to 40 inches. The particle-size control section has 18 to 30 percent clay and 0 to 5 percent rock fragments. The mollic epipedon is 11 to 20 inches thick.
The A and BA horizons have hue of 7.5YR or 10YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3 dry and moist. Reaction is moderately acid through neutral.
The Bt1 horizons have hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4 dry and moist. Texture is silt loam or silty clay loam. and has 0 to 5 percent rock fragments. Reaction is slightly acid or neutral.
The Bt2 horizon has hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4 dry and moist. Texture is silt loam, loam, or clay loam and is 0 to 15 percent rock fragments.
COMPETING SERIES: These are the Annum, Brownlee, Chirpchatter, Ebadlow, Felton, Fisherhill, Goldendale, Lompico, Meland, Mendian (T), Meystre, Quiden, Rehfield, Robbscreek, Schumacher, Stacker, Stardust, Updegraff, Van Horn , and Wakamuticham (T) series.
Annum soils - 40 to 60 inches to a paralithic contact (granodiorite); dry for 90 to 105 consecutive days following the summer solstice
Brownlee soils - 40 to more than 60 inches to a paralithic contact (granodiorite)
Chirpchatter soils - greater than 60 inches to bedrock; dry for greater than 90 consecutive days following the summer solstice
Ebadlow soils - greater than 60 inches to bedrock; dry for 90 to 105 consecutive days following the summer solstice
Felton soils - 40 to 60 inches to a paralithic contact (shale); dry for greater than 90 consecutive days following the summer solstice
Fisherhill soils - greater than 60 inches to bedrock; dry for 90 to 105 consecutive days following the summer solstice
Goldendale soils - greater than 40 inches to bedrock
Lompico soils - 40 to 60 inches to a paralithic contact (sandstone); dry for greater than 90 consecutive days following the summer solstice
Meland soils - dry for 45 to 70 consecutive days following the summer solstice
Mendian soils - greater than 60 inches to bedrock; dry for 90 to 100 consecutive days following the summer solstice
Mystre soils - greater than 60 inches to bedrock; dry for 60 to 75 consecutive days following the summer solstice
Quiden soils - greater than 60 inches to bedrock; dry for 60 to 75 consecutive days following the summer solstice
Rehfield soils - 40 to greater than 60 inches to bedrock; dry for greater than 90 consecutive days following the summer solstice
Robbscreek soils - 20 to 40 inches to a lithic contact (granodiorite); particle-size control section has 15 to 35 percent rock fragments
Schumacher soils - 40 to 60 inches to a lithic contact (metasediments); dry for 45 to 60 consecutive days following the summer solstice
Stacker soils - dry for 90 to 105 consecutive days following the summer solstice
Stardust soils - greater than 60 inches to bedrock
Updegraff soils - 40 to 60 inches to a lithic contact (schist and graywacke); dry for greater than 90 consecutive days following the summer solstice
Van Horn soils - greater than 60 consecutive days following the summer solstice; solum contains mica throughout
Wakamuticham (T) - 40 to 60 inches to a lithic contact (basalt); dry for 60 to 75 consecutive days following the summer solstice
GEOGRAPHIC SETTING: Lorena soils are on plateaus, canyon slopes, hillslopes, and ridgetops at elevations of 300 to 4,200 feet. Slopes are 0 to 65 percent. These soils formed in colluvium derived from basalt mixed with loess and minor amounts of volcanic ash. Summers are warm and dry, winters are cool and moist. The mean annual precipitation is 15 to 18 inches. The average January temperature is 29 degrees F. and the average July temperature is 67 degrees F. The mean annual temperature is 46 to 50 degrees F. The frost-free season is 105 to 150 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Blockhouse, Goldendale, Gunn, Gwin, Rockly and Swalecreek series. Blockhouse soils are more than 60 inches deep to bedrock, have a seasonal high water table and are on footslopes of alluvial plains. Goldendale soils have an argillic horizon, are more than 40 inches deep to bedrock and are on plateaus and side slopes. Gunn soils are more than 60 inches deep, lack a mollic epipedon and are on plateaus and side slopes. Gwin soils are 10 to 20 inches to bedrock and are loamy-skeletal. Rockly soils are loamy-skeletal, 5 to 12 inches deep to bedrock and are on plateaus, ridges, and canyon walls. Swalecreek soils are fine, poorly drained and are on terraces.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used mainly for cropland. Small grains, hay and pasture are common crops. Native vegetation is Oregon white oak, antelope bitterbrush, bluebunch wheatgrass, Sandberg bluegrass, bottlebrush squirreltail and eriogonum.
DISTRIBUTION AND EXTENT: Klickitat and Yakima Counties, Washington. MLRA 8. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Douglas County, Washington, 1998.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 0 to 20 inches
Argillic horizon - the zone from 20 to 36 inches
Lithic contact - the zone beginning at 36 inches
Particle-size control section - the zone from 20 to 36 inches